Burglar alarm



Patented Jan. 5, 1926.

ANTHONY E. COYNE, OF NEW YORK, N. Y.

BUR-GLAR ALARM.

Application filed June 6, 1925. Serial No. 35,324.

1 '0 all whom z't may concern.

' Be it known that I, ANTHONY E. COYNE, a citizen of the United States, and a resident of the citypof New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Burglar Alarm, of which the following is a full, clear, and exact description.

This invention relates to burglar alarms and more particularly to a bell andimproved mounting therefor ona window sash whereby the movement of either sash will cause the bell to sound. 8

An object of the invention is to provide a bell and mountin therefor which may bepositioned at either side of one sash and provide the bell with improved means for controlling the operation of the clapper of the bell whereby thesashes may be set at any desired open position for ventilation or may be entirely closed but which when opened or partially opened release the sounding mechanism of the bell.

My invention therefore contemplates the provision of a bell and controlling means therefor which can be readily installed on any window sash and which will provide an effective burglar alarm.

With these and other objects in view, the invention consists of certain novel features of construction and combinations and arrangements of parts, which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view, mainly in elevation but partly in section, illustrating my improved device in operative position on a window sash;

Figure 2 is a view in horizontal transverse section on the line 2--2 of Figure 1;

Figure 3 is a fragmentary view in vertical longitudinal section on the line 3-3 of Figure 2.

1 represents the lower and 2 the upper sash of a pair of ordinary sliding window sashes. On the upper horizontal bar of the lower sash 1 I secure a bracket 3. This bracket has a base plate 4 suitably perforated for the reception of screws 5 to secure the same on the sash 1.

The upright member of the bracket 8 is secured preferably by a screw 6 with the backplate 7 of a bell A, and it willbe noted that I provide in this backplate a second threaded opening 8 which may receive the screw 6 when the bell is in a reverse position to that shown so as to allow the device to be used either at the right or left-handside of a window casing. The bell A is mainly of the well known standard type.

The sounding or bell portion 9 per so has screw-threaded connection with an arbor 10.

on which a spring 11 is mounted so that by turning the bell portlon 9 the spring can be wound. The spring operates to turn a gear train 11 which causes a star wheel 12 to revolve, and this star wheel 12 engages an escapement member 18 pivotally mounted between its ends as shown at 14. On this escapement member an arm or clapper 15 is secured and carries a head or hammer 16 adapted to engage the inner face of the bell when the escapement device is operated, as is well understood in the art.

It will be noted that instead of providing a straight clapper arm as is customary, 'I bend the clapper arm intermediate its ends into a general V-shape, as shown at 17 and the apex of this V-shaped portion is adapted to engage a shaft 18 which is mounted to turn in the backplate 7.

This shaft 18 is recessed at opposite sides as shown at 19 so that when the shaft is turned slightly in either direction from the position indicated in Figure 1, the clapper arm can vibrate, but when in the position shown in Figure 3 the clapper arm is held against vibrating movement and also the escapement device 13 is held against movement so that the gear train is stopped.

This shaft 18 outside of the bell is made with an opening 20 through which a plunger rod 21 is freely movable. This rod 21 has an enlargement 22 on one end and a smaller enlargement 23 on its other end so as to pre vent escape of the rod from the shaft. A

coil spring 24 is located on the rod 21 be- If either the upper or lower sash is moved the arm 21 will assume an angular position similar to that illustrated in dot and dash lines in Figure 1, and in assuming this position the shaft 18 will be turned so that one of its recesses 19 will be in the path of movement of the bent portion 17 of arm 15 and allow the clapper to move and the bell to operate, to sound an alarm.

This bent portion therefore constitutes an offset or laterally projecting finger which is free to move through either of the recesses 19 but is held by the shaft against movement when in engagement with the face thereof, as shown in Figure 3. The shaft 18 hence is generally V-shaped in cross section at its point of engagement with the clapper and the slightest movement of the sash in either direction from that shown in Figure 3 will allow the clapper to move and the bell to operate.

with my lD'IPl'OVCDlODtS the sashes may be entirely closed or partially open for ventilation, and the alarm can be positioned or set so as to sound in the event that either sash is moved by an imauthorized person. \Vhen the alarm is not desired it is simply necessary to swing the rod 21 completely around carrying with it the shaft 18 to the dotted line position in Figure 1, a pin or stop 25 being provided to hold the rod against further downward movement. \Vhen in this position the shaft 18 will hold the bell against operation and the sashes can be free- 1y operated without sounding the bell.

Various slight changes and alterations might be made in the general form of the parts described without departing from the invention, and hence I do not limit myself to the precise details set forth but consider myself at liberty to make such slight changes i and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. A burglar alarm including a bell hav ing a movable clapper therein, a shaft suping enlargements at both ends, a spring around the rod interposed between the shaft and one of said enlargements. said last-mentioned enlargement adapted to engage a movable member so that when the movable member is moved it will cause the shaft to turn and release the clapper.

2. A burglar alarm including a bell, a shaft projecting from the bell and adapted when in one position to hold the clapper of the bell against movement, a rod movably connected to the shaft located at right angles thereto, said rod adapted to engage a sash, a spring holding said rod in engagement with the sash to prevent turning movement of the shaft, and means for securing the bell to the sash not engaged by the rod so that upon movement of either of the sashes the rod will cause the shaft to turn and release the clapper of the bell to sound an alarm.

ANTHONY E. COYNE. 

